Resonant diaphragm.



svnnnn Hanns Aam essere aren, or sronir Marlowe.

RESQNNT DAPHRGIt.

specification of Letters raient.

Patented riot. if?, 19H13..

."ippiceticn filed March 1, 1915. Serial No. New?,

To oZ I/'wm it 'may conf/cm:

13e 1t known that we, Brianna Harms and )sci-in RYAN, both citizens of the United States, Aand residents of Sioux City, in thel county of- TVimdbury 'and State of Iowa, have invented ccrtam new and useful lmproverncnts in Resonant Diaphragms, of'

which the following-is a specification.

The present invention 'relates to diaphragms for reproducingr sound.

Although the article of-our invention finds its greatest use in phonographs, still it may equally as n'ell be employed in other soundrrnother object of the invention has beenthe productiono an improved article of this class inexpensive inl production.

The .invention will hefnlly understood from the following description, reference beinghad to the accompanying drawings which form a part of this application and in which like characters of reference indicate cori-esponding` parts in both views, of Whicln- Figure l a rear elevation of a phonograph sound-box equipped with the diaphragm of our invention; and Fig. 2 is a central 4horizontal section ofthe same.

`rThe sound-box consists of the usual case embodying a plate, 3, having an annular rim, i, and a.' central opening, 5. l i

The diaphragm, 6, -is inclosed Within the.

ease and is supported between .yieldable A ring, 8,

rings, 7, of insulatingmaterial.

object i sheet of bone, which when properly lprepared and installed, reproduces sound much more naturally than the diaphragms in cornmon use,land. also clarifies the reproduction,

rendering Yit free from rneta'llicsounds,

harshnessand the other evils which attend the use of other diaphraglns.

The diaphragg'm is preparedvrom a por'- tion taken, preferably, from adjacent the surface of a suitable bone. Forthis purpose the shoulder-bladefof an animal is Well suited, the rib of an ox or otherbone having a fiat portion of suiiicientsize for the dia.- phragm desired.v The bone is first-boiled,l

then thoroughly cleaned anda fiatv layer removed' therefrom. The layer is then subjected to a hot aqueous iiuid,as steam or hot water, in "order to render it less-brittle and easy toavorlr. By grinding or cutting the layer is then reduced to a uniform thickness or about one sixty-fonrth of an inch.

it is then held firmly against 'warping and 'then be cut from lthe thin layer.

permitted to thoroughky dry and .is then polished on both sides. The diaphragm'-1nay In S. Patent 985,496, February 28, 1911,`Ballard suggests the'use of ivory for diaphragrns.

for. sound-boxes.

Obviously,the diaphragms may 'be cut and prepared' in any preferredI manner. The subjection of the bon'eto a Huid prior to cutting is arbitrary,` `for perfect results have been attained by cutting the dia,-

' phragms from raw, untreated bone.

,is threaded into the rim and into engagement with thefonter insulating ring, thereby- Although We have described the treatment i and use oibone for thediaphragms, We would not be understood vas being limited to the use of bone, for otherz materials, of like nature, havingporous, lspongy, and flexible properties. fall Within the scope of our' invention.

Therefore, what we claim as new and desire to secure byl Letters Patent of the United States, is,- V

,A resonant diaphragm comprising a thin 'v Asheet prepared from material takenV from adjacent the natural surface ofla bone.

In testimony whereof We have'hereunto set our hands in presence of two subscribing Wa'snesses.,v

` SVERRE HALLS. OSCAR RYAN; v

Witnesses:

M. S. GRANDALL, B. H. Genres'. 

